Maggie earns money from working at the pet store and answering phones. She earns $10 each hour she works at the pet store and $0.25 for each phone call she answers. Maggie answered 60 phone calls and earned $115 last week. Part A: Create an equation that will determine the number of hours she worked at the pet store.

Part B: Solve this equation justifying each step with an algebraic property of equality.

Part C: How many hours did Maggie work at the pet store last week?